Drafting instrument



March 28, 1933,- J. v. KOESTER 1,902,

I DRAFTING INSTRUMENT Filed Sept. 8, 19150 INVENTOR. JOHN W. KOESTER .BYWWG A TTORNEYS.

Patented Mar. 28, 1933 UNITED STATES PATENT OFFICE,

JOHN V. KOESTER, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO EUGENE MORRISON,,

OF LOS ANGELES, CALIFORNIA DRAFTIN G INSTRUMENT Application filed September 8, 1930. Serial No. 480,495.

a r g with which it is used. I have stated that My invention relates to drafting instruments, and it has for its primary ob ect the provision of an instrument of this character which, when used in conjunction with the well-known form of straightedge, will project the marking or scribing portion of the instrument a distance away from the straightedge so that, when ink is employed in connection with the instrument, same will not come against the straightedge, where it would flow onto the drawing paper and, in turn, necessitate an erasure thereof when dried.

A further essential feature of the invenment of this character which gives a wide range of visibility to the scribing or marking portion of the instrument and enable the draftsman to conveniently ascertain the character of line in course of execution.

In the drawing, the figure is a view in end elevation of the instrument.

In carrying the invention into practice, use is made of a head 5 from which extends a suitable form of handle 6, preferably of the kind usually employed in connection with what are known as ruling pens. The head 5 is in the form of a bar of appropriate length to suit the requirements of the invention, and, as illustrated, same extends at right angles to the base portion of said handle.

At one end of the head 5 is a guiding portion 7, while at the opposite end is the marking or scribing portion 8 of the instrument, the length of the latter being co-extensive with the length of the guiding portion 7. By virtue of the head 5 it will be observed that the guiding portion 7 occupies 40 a position substantially in parallelism with the marking or scribing portion '8 of the instrument. The lower end of the guiding portion 7 is preferably formed with a ball point 9 so as to facilitate movement of the instrument across the surface of the paper tion resides in the provision of'an instru-- the head 5 is of an appropriate length that will suit the functions for which the instrument is designed. By this, it should be clearly understood that it is of that length whereby when the. lower portion of the guiding portion 7 is brought to bear lightly against the surface of a straight edge the marking extremity of the scribing portion 8 will be forwardly projected with respect to the straightedge and spaced apart therefrom, so that it will not be possible to cause the writing liquid to smear the edge of the straightedge or to in anyway come in contact therewith, where it could possibly be transferred to the drawing sheet, where it would either appear as a blot or where it might possibly obliterate and mar finely executed portions of a drawing.

Also the length of the head 5 is calculated in a manner that will give to the draftsman a wide range of visibility of the marking or scribing portion 8 of the instrument, thus making it clearly possible for him to always conveniently observe the character of line being drawn by the instrument. This feature is important because it enables the draftsman to assume a more comfortable posture in the execution of a drawing.

I have said that I used in connection with the instrument a scribing or marking portion 8. In this respect, I do not wish to be limited with regard to precise construction of such portion. The portion may be in the form of a pencil, a brush or a pen, the latter being illustrated in the present instance. Also the pen herein shownv is of the adjustable type customarily used as a draftsmans rulingpen.

I claim as my invention:

A drafting instrument comprising a straight handle having a fixed head disposed at right angles to the longitudinal axis thereof and provided with branches of substantially equal length projecting ra-.

v dially from the handle at one end of the latter, a scribing portion extending from one of the branches, and a guiding portion extending from the other of the said branches and disposed in parallelism with the said scribing portion and being of equal length therewith, whereby the scribing portion is adapted to occupy a perpendicular position during movement of the guiding portion over a straight surface of a stralght edge and a position where the lower end thereof is in a plane with the lower end of the said guiding portion. I 1 JOHN V. KOESTER. 

